Troubleshooting - Danfoss VLT AutomationDrive FC 301 Instruction Manual

Diagnostics and Troubleshoo...

7.5 Troubleshooting

Symptom Possible Cause
Missing input power
Missing or open fuses or circuit
breaker tripped
No power to the LCP
Shortcut on control voltage
(terminal 12 or 50) or at
control terminals
Display
Wrong LCP (LCP from VLT
dark/No
2800 or 5000/6000/8000/ FCD
function
or FCM)
Wrong contrast setting
Display (LCP) is defective
Internal voltage supply fault or
SMPS is defective
Overloaded power supply
(SMPS) due to improper control
Intermittent
wiring or a fault within the
display
adjustable frequency drive
Service switch open or missing
motor connection
No line power with 24 V DC
option card
LCP Stop
Motor not
Missing start signal (Standby)
running
Motor coast signal active
(Coasting)
Wrong reference signal source
Motor rotation limit
Motor
Active reversing signal
running in
wrong
direction
Wrong motor phase connection
MG33AN22
Instruction Manual
Test
See Table 4.5.
See open fuses and tripped circuit breaker in
this table for possible causes.
Check the LCP cable for proper connection or
damage.
Check the 24 V control voltage supply for
terminal 12/13 to 20–39 or 10 V supply for
terminal 50 to 55.
®
Test using a different LCP.
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
Check if the motor is connected and the
connection is not interrupted (by a service
switch or other device).
If the display is functioning but no output,
check that line power is applied to the
adjustable frequency drive.
Check if [Off] has been pressed.
Check 5-10 Terminal 18 Digital Input for
correct setting for terminal 18 (use default
setting).
Check 5-12 Terminal 27 Digital Input for
correct setting for terminal 27 (use default
setting).
Check reference signal: Local, remote or bus
reference? Preset reference active? Terminal
connection correct? Scaling of terminals
correct? Reference signal available?
Check that 4-10 Motor Speed Direction is
programmed correctly.
Check if a reversing command is
programmed for the terminal in parameter
group 5-1* Digital inputs.
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
Solution
Check the input power source.
Follow the recommendations provided.
Replace the faulty LCP or connection
cable.
Wire the terminals properly.
Use only LCP 101 (P/N 130B1124) or LCP
102 (P/N. 130B1107).
▲ ▼
Press [Status] + / to adjust the
contrast.
Replace the faulty LCP or connection
cable.
Contact supplier.
If the display stays lit, then the problem is
in the control wiring. Check the wiring for
shorts or incorrect connections. If the
display continues to cut out, follow the
procedure for display dark.
Connect the motor and check the service
switch.
Apply line power to run the unit.
Press [Auto On] or [Hand On] (depending
on your operation mode) to run the
motor.
Apply a valid start signal to start the
motor.
Apply 24 V on terminal 27 or program
this terminal to No operation.
Program correct settings Check
3-13 Reference Site Set preset reference
active in parameter group 3-1* References.
Check for correct wiring. Check scaling of
terminals. Check reference signal.
Program correct settings.
Deactivate reversing signal.
See chapter 5.5 Checking Motor Rotation in
this manual.
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